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POmalloc and free issue
 

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  1. POmalloc and free issue
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    <p>So I have this piece of code, I run it a couple of times:</p> <pre><code>void svnViewStatus() { FILE *file; int i, j, k, q=0, ok; char mystring[100000], *vect[100000], *var, last[12], first[12]; file = fopen("db_svnViewStatus.txt", "r"); if(file == NULL) { printf("error"); } else { i=1; while(fgets(mystring, 100000, file)) { if( i &gt; 1) { j=1; var = strtok(mystring, ";"); while(var != NULL) { if(j==3) { if(i == 2) { strcpy(first, var); } strcpy(last, var); } if(j == 2) { if(q != 0) { ok=1; for(k=0; k&lt;q; k=k+2) { if(strcmp(vect[k], var) == 0) { *vect[k+1]++; ok=0; } } if(ok == 1) { vect[q] = malloc(strlen(var)+1); strcpy(vect[q], var); vect[q+1] = malloc(sizeof(int)); *vect[q+1] = 1; q = q+2; } } else { vect[q] = malloc(strlen(var)+1); strcpy(vect[q], var); vect[q+1] = malloc(sizeof(int)); *vect[q+1] = 1; q = q+2; } } j++; var = strtok(NULL, ";"); } } i++; } } fclose(file); printf("nr: %d \n", i-2); printf("first: %s \n", first); printf("last: %s \n", last); for(i=0; i&lt;q; i = i+2) { printf("User %s: %d \n", *vect[i], *vect[i+1]); } for(i=0; i&lt;q; i=i+1) { free(vect[i]); } } </code></pre> <p>and in the db_svnViewStatus.db I have: </p> <pre><code>NumeRepo:CitateWoodyAllen;DataCreat:12 Nov 2011;Detinator:Ioana;Descriere:Citate ale faimosului regizor Woody Allen 1;Ioana;12 Nov 2011;Woody Allen;What if everything is an illusion and nothing exists? In that case, I definitely overpaid for my carpet. 2;Mihai;12 Nov 2011;Woody Allen;The lion and the calf shall lie down together but the calf won't get much sleep 3;Mihai;13 Nov 2011;Woody Allen;Eighty percent of success is showing up 4;Cristi;23 Nov 2011;Woody Allen;It is impossible to travel faster than the speed of light, and certainly not desirable, as one's hat keeps blowing off 5;Ioana;25 Nov 2011;Woody Allen;I had a terrible education. I attended a school for emotionally disturbed teachers. 6;Cristi;25 Nov 2011;Woody Allen;I will not eat oysters. I want my food dead. Not sick. Not wounded. Dead. </code></pre> <p>But I get this:</p> <p>"HEAP CORRUPTION DETECTED: after Normal block (#54) at 0x000032E90. CRT detected that the application wrote to memory after end of heap buffer."</p> <p>Any help?</p> <p>Also, should I use free after I allocate memory? Why? </p>
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    1. This table or related slice is empty.
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    1. USFinalDestiny
    1. USFinalDestiny
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    1. COYou allocate `vect[q]` and `vect[q+1]`, but you release `vect[0]`..`vect[q-1]`. Did you allocate what you freed and did you free what you allocated?
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      1. USJonathan Leffler
    2. CODoes your compiler complain about any of these? `xx.c:43: warning: value computed is not used / xx.c:78: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’`? If so, fix them. If not, turn up the warning level on your compiler - or get a compiler that does complain. Have you learned about `struct` yet? If so, use one. If not, then there's a marginal excuse for what you're doing, but only marginal. (GCC 4.2.1 / LLVM on MacOS X 10.7.2 with `-Wall -Wextra` produces the warnings shown.)
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      1. USJonathan Leffler
    3. COwhere is that? I didn't use %s with int anywhere. what line? And, yes, I learned about struct...But, why would I use struct if I can work with the data directly there?
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